<style type="text/css">
    .insert-select {
        position: relative;
    }

    .input-box {
        position: absolute;
        height: calc(100% - 4px);
        width: calc(100% - 25px);
        top: 2px;
        left: 2px;
        padding-left: 10px;
        outline: none !important;
        border-radius: 4px !important;
        border: none !important;
    }

</style>

<!--可输入下拉框-->
<div class="insert-select">
    <select ng-attr-placeholder="{{placeholder}}" class="form-control"
            chosen ng-model="modelData"
            ng-options="type[valuefield] as type[textfield] for type in optionList">
        <option value="--请选择--"></option>
    </select>

    <input type="text" class="input-box"
           ng-attr-placeholder="{{placeholder}}"
           ng-model="modelData">
</div>